Treating leather-stock with naphtha to extract oils therefrom



QNo Model.)

J. J. SAWIN. e TRBATING LEATHER STOCK WITH NAPHTHA To BXTRAGT OILS,r

THBRBPROM.

(No. 332,840 Il@ j Patented Deo. 22,1885.

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JAMES J. SAWIN, OF WORCESTER, MASSACHUSETTS.

TREATING LEATHER-STOCK WIIH NAPHTHA TO EXTRACT OlLS THEREFROM.

SPECIFICATION forming part of Letters Patent No. 332,840l dated December 22, 1885,

To all whom, t may concern:

Beit known that 1,' J AMES J. SAWIN, a citizen of the UnitedStates, residing at Worcester, in the county of Worcester andState of Massachusetts, have invented a new and Improved Apparatus for Treating. Leather- Stock with Naphtha to Extract Oils Therefrom; and I do hereby declare that the following is a full, clear, and exact description thereof, which, in connection with the draw ings making a part of this specification, will c enable others skilled in the art to which my invention belongs to make and use the same.

My invention relates to an improved apparatus for treating leather-stock with naphtha, and for drying leather-stock so treated in such a manner that the vapor thrown off from the leather by the drying process will be condensed and recovered 5 and my invention con` sists in certain-novel features of construction of the apparatus, to be hereinafter fully de'- scribed, and the nature thereof indicated by the claims.

Referring to the drawings, Figure l represents a side elevation of my improved apparatus, a portion of the side being broken away to show wthe interior arrangement. Fig. 2 is a central vertical longitudinal section through the parts shown in Fig. 1; and Fig. 3 is a horizontal longitudinal section on line x Fig. 1, looking in the direction of arrow, same figure.

In the accompanying drawings, the part marked Ais a tank, made, in this instance, of rectangular shape, of plates of iron bolted together, and having an opening in the top part thereof of any suitable size, which opening is provided, in this instance, with ahinged cover, B, which can be securely bolted or fastened down. An inlet-pipe, C, extends through the top of the tank through which the ytank can be filled after the cover B is closed. To the inner sides of the tank are secured, in this instance by means of bolts d d, beams D D,ex tending along the sides of the tank horizontally at the top thereof,and about one-quarter of the height of the tank from the bottom thereof to the beams D D are secured, in this instance, vertical cross pieces or bars E E, placed at ashort distance apart, and so placed 5o as to leave an open space or chamber, H, on

each side of the tank, between the side of the tank and the cross-pieces E, the beams D D Application filed July 20, 1885. Serial N o. 172,177. (No model.)

forming the top-and bottom of said chamber or space. Through the lower part of the tank, about one foot from the bottom thereof, a platform or open floor extends, as shown in Fig. 3, composed of the cross-piecesI, secured to or resting upon the lower beams, D, bolted, as before stated, to the sides ofthe tank. This floor divides the tank into two compartmentsthe upper part, J, or heatingchamber in which thebags or sacks containing the leather to be treated are placed, and the lower part, F, which I call the coolingchamberJ Around the sides of the tank in the upper compartment, J, extend coils of steam-pipes P. These pipes may extend horizontally, as shown in the drawings, or vertically up and down, if preferred. They are placed in the'space H, before described, between the sides of the tank and the lattice-work formed by the bealns D and cross-pieces E. The steam-pipes P P may extend all around the tank A, or only on opposite sides thereof, as desired; but itis best to have them extend from the top to the bottom of the compartment J, as shown in Fig. 2, in orderthat a uniform heat may be thrown out in all parts of said compartment. The lattice-work around the sides of the tank on the outside ofthe pipes P prevents the leather coming in contact with the hot steam-pipes and being burned or scorched. One end of the coils of pipes P extends through the upper part of the tank, through which steam is admitted, and the other end through the lower part of the tank or of the compartment J, as shown in the drawings. Directly beneath the floor or bottom of the upper compartment, J, in the upper part of the compartment F, extend coils of pipe R, which are substantially parallel to the bottom of the tank, as shown in the drawings. The ends of the coil extend through the sides of the tank, to allowr of cold water being` pumped or run into the coil R, and also drawn off from the coil. Through the bottom of the tank A an outlet-pipe, G, extends, to allow of the naphtha being drawn off from the tank. I prefer to have the coils of cold-water pipes R extend through the upper part of the chamber or compartment F; but they may extend through the middle part or in the lower part of said compartment F, if desired.

The operation of my improved apparatus IOO will be readily understood from the drawings,

in connection with the above description, and is as follows: The leather-stock to be treated, generally contained in bags or sacks, is thrown into the upper compartment, J, of the tank, through the opening in the top ofthe tank. The bags or sacks rest upon the floor or platform in the lower part of the tank, before mentioned. After a sufficient number of bags have been placed in the compartment J the cover Bis closed and fastened, the outlet-pipe G is also closed, and naphtha is admitted into the tank through the inlet-pipe G, filling the compartments F and J. After the naphtha has acted on the leather to extract the oil therefrom, which it holds in solution, it is drawn off from the tank through the outlet-pipe G, and steam is admitted into the pipes P, surrounding the upper compartment, J, which contains the leather acted on by the naphtha. At the same time cold water is admitted into the coil of pipes R, directly beneath the chamber J, and extending in the cooling-chamber F. rPhe steam in the pipesPheats uniformly the air in the chamber J, causing the naphtha remaining in the leather-stock and bagsto be evaporated. This naphtha-vapor is heavier than the air, and it therefore sinks and passes through the bottom of the chamber into the cooling-chamber F, which is kept cool by the cold water running through the pipts R, where the naphtha-vapor is condensed. The naphtha so condensed in the cooling-chamber F is drawn off through the outlet-pipe G and none of the naphtha is lost.

I have shown in the drawingsatank of rectangular shape, having an opening in the top thereof; but I do not limit myself to such a shaped tank for carrying out my invention, for a square tank or a round tank may be used, if preferred, and the steam-pipes P, instead of extending only upon two sides of the upper compartment, J, as shown in the drawings, may extend around on all four sides, if preferred.

rIhe lattice-work forming the sides and bottom of the upper compartment, J, may be made in any other form desired, having the crosspieces run slanting or angular or crossing each other. rlhe main object of this lattice-work is to prevent the leather-stock coming in direct contact with the steam pipes. Any equivalent device may be used in lieu thereof, and the lattice-work may be dispensed with entirely, the upper compartment being formed by the sides of the tank itself', and a perforated or opened partition or division running through the lower part of the tank, to form the floor upon which the leatherstock rests or is placed.

My apparatus may be used, if preferred, simply as a drying-tank, the leather-stock having been tirst immersed in naphtha in some other suitable tank, and taken therefrom and placed in the drying-chamber J of my apparatus, when the operation of drying and condensing the naphtha will be the same as previously described, after the naphtha has been drawn off from my apparatus.

The main feature of my invention is the combining, in a single tank or receptacle, ofa heated chamber for drying the leather-stock, and a cooling-chamber for condensing the naphtha evaporated from the stock; and I am enabled to do this by arranging the steampipes around the sides of the drying-chamber, as described,and the cold-water pipes directly under the drying chamber in the coolingchamber.

I have described my improved apparatus when used for treating leatherstock, but I do not wish to limit myself to this, for my apparatus can also be used for treating wool-stock or other stock for the purpose of extracting oil therefrom, and for drying the same and condensing the surplus naphtha.

Having described my invention, what I` claim as new, and desire to secure byv Letters Patent, is l l. In a tank for treating leather or other stock with naphtha, the combinatiomwith the heating-chamber for drying the stock, having l coils of steam-pipes extending around two or more sides of said chamber, of the coolingchamber having a coil or coils of cold-water pipes, substantially as and for the purpose J stated.

2. In a tank, A, the combination, with the heating-chamber J,having coils of steam-pipes P extending around one or more sides of said s. IOO

chamber, for the purpose stated, of the eooling-chamber F, having coils of cold-water pipes extending therein, for the purpose stated, substantially as set forth.

3. In a tank,A, the heating-chamber J,hav ing a lattice-work extending around the sides thereof, and steam-pipes extending between said lattice-work and the sides of the tank, in combination with a cooling-chamber, F, having coils of cold-water pipes R extending therein, and an opened lattice-work or loor above said pipes, separating the said coolingchamber F from the heatingchamber J, substantially as described, and for the purpose stated.

4. A tank,A, constructed with the heatingchamber J, having steam-pipes P, for the purpose stated, and a cooling-chamber, F, having cold-water pipes R, for thepurpose stated, substantially as set forth.

5. A tank, A, having one or more openings in the top thereof, provided with covers, an outlet-pipe, G, an inlet-pi pe, C, coils of steampipes P in the upper part of the tank, and coils of cold-water pipes R in the lower part of the tank, the ends of said coils projecting through the sides or ends of the tank, substantially as set forth.

JAMES J. SAWIN.

NVitnesses:

JOHN C. DEWEY, FRED. W. SMITH.

rfI5 

